<html>
<head>
    <title>Golang Chat</title>

<script src="http://libs.baidu.com/jquery/1.4.2/jquery.min.js"></script>
<meta charset="UTF-8" />
    <script type="text/javascript">
    
        $(function() {
            function getUrlParam(name)
            {
                var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象
                var r = window.location.search.substr(1).match(reg);  //匹配目标参数
                if (r!=null) return unescape(r[2]); return null; //返回参数值
            }
            var conn;
            var msg = $("#msg");
            var log = $("#log");
            uid=getUrlParam("uid");
            to_uid=getUrlParam("to_uid");

            function appendLog(msg) {
                var d = log[0]
                var doScroll = d.scrollTop == d.scrollHeight - d.clientHeight;
                msg.appendTo(log)
                if (doScroll) {
                    d.scrollTop = d.scrollHeight - d.clientHeight;
                }
            }

            $("#form").submit(function() {
                if (!conn) {
                    return false;
                }
                if (!msg.val()) {
                    return false;
                }
                var json = {"sender":uid,"recipient":to_uid,"content":msg.val()}; //创建对象；
                var jsonStr = JSON.stringify(json);       //转为JSON字符串

                conn.send(jsonStr);
                msg.val("");
                return false
            });

            if (window["WebSocket"]) {
                conn = new WebSocket("ws://localhost:9999/ws/ws?uid="+uid+"&to_uid="+to_uid);
                conn.onclose = function(evt) {
                    appendLog($("<div><b>Connection Closed.</b></div>"))
                }
                conn.onmessage = function(evt) {
                    
                    appendLog($("<div/>").text(evt.data))
                }
            } else {
                appendLog($("<div><b>WebSockets Not Support.</b></div>"))
            }
        });
    </script>
    <style type="text/css">
        html {
            overflow: hidden;
        }

        body {
            overflow: hidden;
            padding: 0;
            margin: 0;
            width: 100%;
            height: 100%;
            background: gray;
        }

        #log {
            background: white;
            margin: 0;
            padding: 0.5em 0.5em 0.5em 0.5em;
            position: absolute;
            top: 0.5em;
            left: 0.5em;
            right: 0.5em;
            bottom: 3em;
            overflow: auto;
        }

        #form {
            padding: 0 0.5em 0 0.5em;
            margin: 0;
            position: absolute;
            bottom: 1em;
            left: 0px;
            width: 100%;
            overflow: hidden;
        }

    </style>
</head>
<body>
<div id="log"></div>
<form id="form">
    <input type="submit" value="发送" />
    <input type="text" id="msg" size="64"/>
</form>
</body>
</html>